Strong modification of the transport level alignment in organic materials after optical excitation

Benjamin Stadtmüller (), Sebastian Emmerich, Dominik Jungkenn, Norman Haag, Markus Rollinger, Steffen Eich, Mahalingam Maniraj, Martin Aeschlimann, Mirko Cinchetti and Stefan Mathias
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Benjamin Stadtmüller: University of Kaiserslautern
Sebastian Emmerich: University of Kaiserslautern
Dominik Jungkenn: University of Kaiserslautern
Norman Haag: University of Kaiserslautern
Markus Rollinger: University of Kaiserslautern
Steffen Eich: University of Kaiserslautern
Mahalingam Maniraj: University of Kaiserslautern
Martin Aeschlimann: University of Kaiserslautern
Mirko Cinchetti: Technische Universität Dortmund
Stefan Mathias: Georg-August-Universität Göttingen

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Organic photovoltaic devices operate by absorbing light and generating current. These two processes are governed by the optical and transport properties of the organic semiconductor. Despite their common microscopic origin—the electronic structure—disclosing their dynamical interplay is far from trivial. Here we address this issue by time-resolved photoemission to directly investigate the correlation between the optical and transport response in organic materials. We reveal that optical generation of non-interacting excitons in a fullerene film results in a substantial redistribution of all transport levels (within 0.4 eV) of the non-excited molecules. As all observed dynamics evolve on identical timescales, we conclude that optical and transport properties are completely interlinked. This finding paves the way for developing novel concepts for transport level engineering on ultrafast time scales that could lead to novel functional optoelectronic devices.

Date: 2019
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DOI: 10.1038/s41467-019-09136-7

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